【摘要】 为探明硅对冬青稞生长及冷胁迫后叶片光合作用的影响,以2种当地主栽青稞品种为试验材料,采用水培试验测定了不同浓度硅处理下(0mmol/L、0.2mmol/L和1.0mmol/L)冬青稞植株的含水量、根冠比、低温胁迫下青稞的细胞膜相对透性、恢复常温后青稞叶片的叶绿素含量和光合速率。结果表明:硅处理可显著增加冬青稞的根冠比,增加青稞叶片硅的含量,降低细胞膜在冷胁迫时的损伤;但对常温时的青稞叶片叶绿素含量及光合速率影响不大,而在低温胁迫后,硅处理青稞叶绿素含量及光合速率均显著高于无硅处理的青稞。同时,青稞对硅的吸收利用在品种之间存在差异,果洛在低浓度时(0.2mmol/L)即大量累积,而喜马拉雅19在高浓度时(1.0mmol/L)累积更显著。更多还原

【Abstract】 To illustrate the effects of silicon on hulless barley seedling growing and photosynthetic after cold stress,Two hulless barley cultivars were selected and hydroponic experiment were performed with0mmol/L,0.1 mmol/L or 1.0 mmol/L Si treatments.Water content,root shoot ratio,Si content in leaves,chlorophyll content and leaf photosynthesis were measured before cold stress,cytomembrane penetrability,chlorophyll content,leaf photosynthesis were detected after cold stress either.Results:With the Si content increasing,root shoot ratio and Si content in leaves increased significantly,cytomembrane penetrability reduced under cold stress,chlorophyll content and leaf photosynthesis were not remarkably different in normal temperature,but chlorophyll content and leaf photosynthesis significantly increased after cold stress in hulless barley seedling.The authors also found different absorption and utilization between the two cultivars,Guoluo showed better Si accumulation in lower Si concentration(0.2 mmol/L)and Himalaya19 showed better Si accumulation in high Si concentration(1mmol/L).更多还原